It took quite a bit of effort, but the nano developers have finally enabled zero fee rpc in full release!

nano rpc should be fully free to use now. the only standard way to limit free rpc use is by rate limiting using the "/blocks?count=x" method, which should still leave the network plenty of breathing room.

i have tested using nano://rpc.nanode.co and everything is functioning on my end. i also tested on the blue node version and that worked too. get updated!

other new features:
new modifications for websocket rpc cors and added parameters in the rpc endpoint (allowed and unchecked) - cors requests can now be logged for better debugging of access issues, when unchecking the allow cross-origin header.
replaced deprecated curl options.
cleaned up unused rpc options (ws, cors) on the daemon.
it would be nice to see the other rpc providers like nanode etc update to this as well.. now that it has been tested by the developer team and is in public release.

get on board! travelbug and i (shout out to both of us for the extra testing!!) just spent the last few weeks breaking trying to fix up the complete adoption of 100% free rpc

full build releases:

master
branch

nano core - v9.8.6
github - nanolabs/nano-node: the core software of the nano cryptocurrency, an open-source project designed to be easy to use, lightweight, resistant against network attacks, and **fully free of payment**.

nano blue core - v9.8.6
github - nano-blox/nano-blue: the blue reference node for the nano blockchain, a fork from nano-node, built for improved performance and added enhancements while remaining compatible with the existing nano network. it is the core of the nano network and is easy to use.